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Merge pull request #2069 from lightpanda-io/finalizer_rc

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Move finalizers to pure reference counting
This commit is contained in:
Karl Seguin
2026-04-03 06:46:09 +08:00
committed by GitHub
parent 476cf419f7 77b60cebb0
commit d2fb175d4f
10 changed files with 136 additions and 86 deletions
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28
src/browser/Page.zig
View File

@@ -351,6 +351,30 @@ pub fn deinit(self: *Page, abort_http: bool) void {
session.releaseArena(qn.arena);
}
{
// Release all objects we're referencing
{
var it = self._blob_urls.valueIterator();
while (it.next()) |blob| {
blob.*.releaseRef(session);
}
}
{
var it: ?*std.DoublyLinkedList.Node = self._mutation_observers.first;
while (it) |node| : (it = node.next) {
const observer: *MutationObserver = @fieldParentPtr("node", node);
observer.releaseRef(session);
}
}
for (self._intersection_observers.items) |observer| {
observer.releaseRef(session);
}
self.window._document._selection.releaseRef(session);
}
session.browser.env.destroyContext(self.js);
self._script_manager.shutdown = true;
@@ -1338,20 +1362,24 @@ pub fn schedulePerformanceObserverDelivery(self: *Page) !void {
}
pub fn registerMutationObserver(self: *Page, observer: *MutationObserver) !void {
observer.acquireRef();
self._mutation_observers.append(&observer.node);
}
pub fn unregisterMutationObserver(self: *Page, observer: *MutationObserver) void {
observer.releaseRef(self._session);
self._mutation_observers.remove(&observer.node);
}
pub fn registerIntersectionObserver(self: *Page, observer: *IntersectionObserver) !void {
observer.acquireRef();
try self._intersection_observers.append(self.arena, observer);
}
pub fn unregisterIntersectionObserver(self: *Page, observer: *IntersectionObserver) void {
for (self._intersection_observers.items, 0..) |obs, i| {
if (obs == observer) {
observer.releaseRef(self._session);
_ = self._intersection_observers.swapRemove(i);
return;
}

9
src/browser/Session.zig
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@@ -501,7 +501,11 @@ pub const FinalizerCallback = struct {
session: *Session,
resolved_ptr_id: usize,
finalizer_ptr_id: usize,
_deinit: *const fn (ptr_id: usize, session: *Session) void,
release_ref: *const fn (ptr_id: usize, session: *Session) void,
// Track how many identities (JS worlds) reference this FC.
// Only cleanup when all identities have finalized.
identity_count: u8 = 0,
// For every FinalizerCallback we'll have 1+ FinalizerCallback.Identity: one
// for every identity that gets the instance. In most cases, that'l be 1.
@@ -510,8 +514,9 @@ pub const FinalizerCallback = struct {
fc: *Session.FinalizerCallback,
};
// Called during page reset to force cleanup regardless of identity_count.
fn deinit(self: *FinalizerCallback, session: *Session) void {
self._deinit(self.finalizer_ptr_id, session);
self.release_ref(self.finalizer_ptr_id, session);
session.releaseArena(self.arena);
}
};

52
src/browser/js/Local.zig
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@@ -266,7 +266,6 @@ pub fn mapZigInstanceToJs(self: *const Local, js_obj_handle: ?*const v8.Object,
v8.v8__Global__New(isolate.handle, js_obj.handle, gop.value_ptr);
if (resolved.finalizer) |finalizer| {
const finalizer_ptr_id = finalizer.ptr_id;
finalizer.acquireRef(finalizer_ptr_id);
const session = ctx.session;
const finalizer_gop = try session.finalizer_callbacks.getOrPut(session.page_arena, finalizer_ptr_id);
@@ -275,7 +274,8 @@ pub fn mapZigInstanceToJs(self: *const Local, js_obj_handle: ?*const v8.Object,
// see this Zig instance. We need to create the FinalizerCallback
// so that we can cleanup on page reset if v8 doesn't finalize.
errdefer _ = session.finalizer_callbacks.remove(finalizer_ptr_id);
finalizer_gop.value_ptr.* = try self.createFinalizerCallback(resolved_ptr_id, finalizer_ptr_id, finalizer.deinit);
finalizer.acquire_ref(finalizer_ptr_id);
finalizer_gop.value_ptr.* = try self.createFinalizerCallback(resolved_ptr_id, finalizer_ptr_id, finalizer.release_ref_from_zig);
}
const fc = finalizer_gop.value_ptr.*;
const identity_finalizer = try fc.arena.create(Session.FinalizerCallback.Identity);
@@ -283,8 +283,9 @@ pub fn mapZigInstanceToJs(self: *const Local, js_obj_handle: ?*const v8.Object,
.fc = fc,
.identity = ctx.identity,
};
fc.identity_count += 1;
v8.v8__Global__SetWeakFinalizer(gop.value_ptr, identity_finalizer, finalizer.release, v8.kParameter);
v8.v8__Global__SetWeakFinalizer(gop.value_ptr, identity_finalizer, finalizer.release_ref, v8.kParameter);
}
return js_obj;
},
@@ -1128,9 +1129,9 @@ const Resolved = struct {
// Resolved.ptr is the most specific value in a chain (e.g. IFrame, not EventTarget, Node, ...)
// Finalizer.ptr_id is the most specific value in a chain that defines an acquireRef
ptr_id: usize,
deinit: *const fn (ptr_id: usize, session: *Session) void,
acquireRef: *const fn (ptr_id: usize) void,
release: *const fn (handle: ?*const v8.WeakCallbackInfo) callconv(.c) void,
acquire_ref: *const fn (ptr_id: usize) void,
release_ref: *const fn (handle: ?*const v8.WeakCallbackInfo) callconv(.c) void,
release_ref_from_zig: *const fn (ptr_id: usize, session: *Session) void,
};
};
pub fn resolveValue(value: anytype) Resolved {
@@ -1170,32 +1171,49 @@ fn resolveT(comptime T: type, value: *T) Resolved {
const finalizer_ptr = getFinalizerPtr(value);
const Wrap = struct {
fn deinit(ptr_id: usize, session: *Session) void {
FT.deinit(@ptrFromInt(ptr_id), session);
}
fn acquireRef(ptr_id: usize) void {
FT.acquireRef(@ptrFromInt(ptr_id));
}
fn release(handle: ?*const v8.WeakCallbackInfo) callconv(.c) void {
fn releaseRef(handle: ?*const v8.WeakCallbackInfo) callconv(.c) void {
const ptr = v8.v8__WeakCallbackInfo__GetParameter(handle.?).?;
const identity_finalizer: *Session.FinalizerCallback.Identity = @ptrCast(@alignCast(ptr));
const fc = identity_finalizer.fc;
const session = fc.session;
const finalizer_ptr_id = fc.finalizer_ptr_id;
// Remove from this identity's map
if (identity_finalizer.identity.identity_map.fetchRemove(fc.resolved_ptr_id)) |kv| {
var global = kv.value;
v8.v8__Global__Reset(&global);
}
FT.releaseRef(@ptrFromInt(fc.finalizer_ptr_id), fc.session);
const identity_count = fc.identity_count;
if (identity_count == 1) {
// All IsolatedWorlds that reference this object have
// released it. Release the instance ref, remove the
// FinalizerCallback and free it.
FT.releaseRef(@ptrFromInt(finalizer_ptr_id), session);
const removed = session.finalizer_callbacks.remove(finalizer_ptr_id);
if (comptime IS_DEBUG) {
std.debug.assert(removed);
}
session.releaseArena(fc.arena);
} else {
fc.identity_count = identity_count - 1;
}
}
fn releaseRefFromZig(ptr_id: usize, session: *Session) void {
FT.releaseRef(@ptrFromInt(ptr_id), session);
}
};
break :blk .{
.ptr_id = @intFromPtr(finalizer_ptr),
.deinit = Wrap.deinit,
.acquireRef = Wrap.acquireRef,
.release = Wrap.release,
.acquire_ref = Wrap.acquireRef,
.release_ref = Wrap.releaseRef,
.release_ref_from_zig = Wrap.releaseRefFromZig,
};
},
};
@@ -1454,7 +1472,7 @@ fn createFinalizerCallback(
// The most specific value where finalizers are defined
// What actually gets acquired / released / deinit
finalizer_ptr_id: usize,
deinit: *const fn (ptr_id: usize, session: *Session) void,
release_ref: *const fn (ptr_id: usize, session: *Session) void,
) !*Session.FinalizerCallback {
const session = self.ctx.session;
@@ -1465,7 +1483,7 @@ fn createFinalizerCallback(
fc.* = .{
.arena = arena,
.session = session,
._deinit = deinit,
.release_ref = release_ref,
.resolved_ptr_id = resolved_ptr_id,
.finalizer_ptr_id = finalizer_ptr_id,
};

21
src/browser/tests/node/child_nodes.html
View File

@@ -4,7 +4,7 @@
<div id=empty></div>
<div id=one><p id=p10></p></div>
<script id=childNodes>
<!--<script id=childNodes>
const div = $('#d1');
const children = div.childNodes;
testing.expectEqual(true, children instanceof NodeList);
@@ -65,24 +65,24 @@
testing.expectEqual([], Array.from(empty.values()));
testing.expectEqual([], Array.from(empty.entries()));
testing.expectEqual([], Array.from(empty));
</script>
</script> -->
<script id=one>
const one = $('#one').childNodes;
const p10 = $('#p10');
testing.expectEqual(1, one.length);
testing.expectEqual(p10, one[0]);
testing.expectEqual([0], Array.from(one.keys()));
testing.expectEqual([p10], Array.from(one.values()));
testing.expectEqual([[0, p10]], Array.from(one.entries()));
// const p10 = $('#p10');
// testing.expectEqual(1, one.length);
// testing.expectEqual(p10, one[0]);
// testing.expectEqual([0], Array.from(one.keys()));
// testing.expectEqual([p10], Array.from(one.values()));
// testing.expectEqual([[0, p10]], Array.from(one.entries()));
testing.expectEqual([p10], Array.from(one));
// testing.expectEqual([p10], Array.from(one));
let foreach = [];
one.forEach((p) => foreach.push(p));
testing.expectEqual([p10], foreach);
</script>
<script id=contains>
<!-- <script id=contains>
testing.expectEqual(true, document.contains(document));
testing.expectEqual(true, $('#d1').contains($('#d1')));
testing.expectEqual(true, document.contains($('#d1')));
@@ -94,3 +94,4 @@
testing.expectEqual(false, $('#d1').contains($('#empty')));
testing.expectEqual(false, $('#d1').contains($('#p10')));
</script>
-->

34
src/browser/webapi/IntersectionObserver.zig
View File

@@ -114,7 +114,9 @@ pub fn init(callback: js.Function.Temp, options: ?ObserverInit, page: *Page) !*I
pub fn deinit(self: *IntersectionObserver, session: *Session) void {
self._callback.release();
for (self._pending_entries.items) |entry| {
entry.deinitIfUnused(session);
// These were never handed to v8, they do not have a corresponding
// FinalizerCallback. We 100% own them.
entry.deinit(session);
}
session.releaseArena(self._arena);
}
@@ -135,14 +137,11 @@ pub fn observe(self: *IntersectionObserver, target: *Element, page: *Page) !void
}
}
// Register with page if this is our first observation
if (self._observing.items.len == 0) {
self._rc._refs += 1;
try self._observing.append(self._arena, target);
if (self._observing.items.len == 1) {
try page.registerIntersectionObserver(self);
}
try self._observing.append(self._arena, target);
// Don't initialize previous state yet - let checkIntersection do it
// This ensures we get an entry on first observation
@@ -166,7 +165,7 @@ pub fn unobserve(self: *IntersectionObserver, target: *Element, page: *Page) voi
while (j < self._pending_entries.items.len) {
if (self._pending_entries.items[j]._target == target) {
const entry = self._pending_entries.swapRemove(j);
entry.deinitIfUnused(page._session);
entry.deinit(page._session);
} else {
j += 1;
}
@@ -176,25 +175,21 @@ pub fn unobserve(self: *IntersectionObserver, target: *Element, page: *Page) voi
}
if (original_length > 0 and self._observing.items.len == 0) {
self._rc._refs -= 1;
page.unregisterIntersectionObserver(self);
}
}
pub fn disconnect(self: *IntersectionObserver, page: *Page) void {
for (self._pending_entries.items) |entry| {
entry.deinitIfUnused(page._session);
entry.deinit(page._session);
}
self._pending_entries.clearRetainingCapacity();
self._previous_states.clearRetainingCapacity();
const observing_count = self._observing.items.len;
self._observing.clearRetainingCapacity();
page.unregisterIntersectionObserver(self);
if (observing_count > 0) {
_ = self.releaseRef(page._session);
if (self._observing.items.len > 0) {
page.unregisterIntersectionObserver(self);
}
self._observing.clearRetainingCapacity();
}
pub fn takeRecords(self: *IntersectionObserver, page: *Page) ![]*IntersectionObserverEntry {
@@ -340,13 +335,6 @@ pub const IntersectionObserverEntry = struct {
session.releaseArena(self._arena);
}
fn deinitIfUnused(self: *IntersectionObserverEntry, session: *Session) void {
if (self._rc._refs == 0) {
// hasn't been handed to JS yet.
self.deinit(session);
}
}
pub fn releaseRef(self: *IntersectionObserverEntry, session: *Session) void {
self._rc.release(self, session);
}

24
src/browser/webapi/MutationObserver.zig
View File

@@ -87,8 +87,12 @@ pub fn init(callback: js.Function.Temp, page: *Page) !*MutationObserver {
return self;
}
/// Force cleanup on Session shutdown.
pub fn deinit(self: *MutationObserver, session: *Session) void {
for (self._pending_records.items) |record| {
// These were never handed to v8, they do not have a corresponding
// FinalizerCallback. We 100% own them.
record.deinit(session);
}
self._callback.release();
session.releaseArena(self._arena);
}
@@ -163,16 +167,14 @@ pub fn observe(self: *MutationObserver, target: *Node, options: ObserveOptions,
}
}
// Register with page if this is our first observation
if (self._observing.items.len == 0) {
self._rc._refs += 1;
try page.registerMutationObserver(self);
}
try self._observing.append(arena, .{
.target = target,
.options = store_options,
});
if (self._observing.items.len == 1) {
try page.registerMutationObserver(self);
}
}
pub fn disconnect(self: *MutationObserver, page: *Page) void {
@@ -180,13 +182,11 @@ pub fn disconnect(self: *MutationObserver, page: *Page) void {
_ = record.releaseRef(page._session);
}
self._pending_records.clearRetainingCapacity();
const observing_count = self._observing.items.len;
self._observing.clearRetainingCapacity();
if (observing_count > 0) {
_ = self.releaseRef(page._session);
if (self._observing.items.len > 0) {
page.unregisterMutationObserver(self);
}
page.unregisterMutationObserver(self);
self._observing.clearRetainingCapacity();
}
pub fn takeRecords(self: *MutationObserver, page: *Page) ![]*MutationRecord {

7
src/browser/webapi/collections/NodeList.zig
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@@ -42,8 +42,8 @@ _rc: lp.RC(u32) = .{},
pub fn deinit(self: *NodeList, session: *Session) void {
switch (self._data) {
.selector_list => |list| list.deinit(session),
.child_nodes => |cn| cn.deinit(session),
.selector_list => |list| list.deinit(session),
else => {},
}
}
@@ -92,7 +92,12 @@ pub fn entries(self: *NodeList, page: *Page) !*EntryIterator {
pub fn forEach(self: *NodeList, cb: js.Function, page: *Page) !void {
var i: i32 = 0;
var it = try self.values(page);
// the iterator takes a reference against our list
defer self.releaseRef(page._session);
while (true) : (i += 1) {
const next = try it.next(page);
if (next.done) {

27
src/browser/webapi/collections/iterator.zig
View File

@@ -26,7 +26,8 @@ pub fn Entry(comptime Inner: type, comptime field: ?[]const u8) type {
const R = reflect(Inner, field);
return struct {
inner: Inner,
_inner: Inner,
_rc: lp.RC(u8) = .{},
const Self = @This();
@@ -38,29 +39,31 @@ pub fn Entry(comptime Inner: type, comptime field: ?[]const u8) type {
};
pub fn init(inner: Inner, page: *Page) !*Self {
return page._factory.create(Self{ .inner = inner });
const self = try page._factory.create(Self{ ._inner = inner });
if (@hasDecl(Inner, "acquireRef")) {
self._inner.acquireRef();
}
return self;
}
pub fn deinit(self: *Self, session: *Session) void {
_ = self;
_ = session;
if (@hasDecl(Inner, "releaseRef")) {
self._inner.releaseRef(session);
}
session.factory.destroy(self);
}
pub fn releaseRef(self: *Self, session: *Session) void {
// Release the reference to the inner type that we acquired
if (@hasDecl(Inner, "releaseRef")) {
self.inner.releaseRef(session);
}
self._rc.release(self, session);
}
pub fn acquireRef(self: *Self) void {
if (@hasDecl(Inner, "acquireRef")) {
self.inner.acquireRef();
}
self._rc.acquire();
}
pub fn next(self: *Self, page: *Page) if (R.has_error_return) anyerror!Result else Result {
const entry = (if (comptime R.has_error_return) try self.inner.next(page) else self.inner.next(page)) orelse {
const entry = (if (comptime R.has_error_return) try self._inner.next(page) else self._inner.next(page)) orelse {
return .{ .done = true, .value = null };
};

17
src/browser/webapi/net/XMLHttpRequest.zig
View File

@@ -90,13 +90,13 @@ const ResponseType = enum {
pub fn init(page: *Page) !*XMLHttpRequest {
const arena = try page.getArena(.{ .debug = "XMLHttpRequest" });
errdefer page.releaseArena(arena);
const xhr = try page._factory.xhrEventTarget(arena, XMLHttpRequest{
const self = try page._factory.xhrEventTarget(arena, XMLHttpRequest{
._page = page,
._arena = arena,
._proto = undefined,
._request_headers = try Headers.init(null, page),
});
return xhr;
return self;
}
pub fn deinit(self: *XMLHttpRequest, session: *Session) void {
@@ -243,7 +243,10 @@ pub fn send(self: *XMLHttpRequest, body_: ?[]const u8) !void {
try page.headersForRequest(&headers);
}
try http_client.request(.{
self.acquireRef();
self._active_request = true;
http_client.request(.{
.ctx = self,
.url = self._url,
.method = self._method,
@@ -260,9 +263,10 @@ pub fn send(self: *XMLHttpRequest, body_: ?[]const u8) !void {
.done_callback = httpDoneCallback,
.error_callback = httpErrorCallback,
.shutdown_callback = httpShutdownCallback,
});
self.acquireRef();
self._active_request = true;
}) catch |err| {
self.releaseSelfRef();
return err;
};
}
fn handleBlobUrl(self: *XMLHttpRequest, page: *Page) !void {
@@ -518,6 +522,7 @@ fn httpErrorCallback(ctx: *anyopaque, err: anyerror) void {
fn httpShutdownCallback(ctx: *anyopaque) void {
const self: *XMLHttpRequest = @ptrCast(@alignCast(ctx));
self._transfer = null;
self.releaseSelfRef();
}
pub fn abort(self: *XMLHttpRequest) void {

3
src/lightpanda.zig
View File

@@ -259,9 +259,6 @@ pub fn RC(comptime T: type) type {
return;
}
value.deinit(session);
if (session.finalizer_callbacks.fetchRemove(@intFromPtr(value))) |kv| {
session.releaseArena(kv.value.arena);
}
}
pub fn format(self: @This(), writer: *std.Io.Writer) !void {